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GET /api/1.2/patches/2218945/?format=api
{ "id": 2218945, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2218945/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260402-cmpxchg-v1-1-4561e2c05d2c@gmail.com/", "project": { "id": 2, "url": "http://patchwork.ozlabs.org/api/1.2/projects/2/?format=api", "name": "Linux PPC development", "link_name": "linuxppc-dev", "list_id": "linuxppc-dev.lists.ozlabs.org", "list_email": "linuxppc-dev@lists.ozlabs.org", "web_url": "https://github.com/linuxppc/wiki/wiki", "scm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git", "webscm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/", "list_archive_url_format": "https://lore.kernel.org/linuxppc-dev/{}/", "commit_url_format": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id={}" }, "msgid": "<20260402-cmpxchg-v1-1-4561e2c05d2c@gmail.com>", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/20260402-cmpxchg-v1-1-4561e2c05d2c@gmail.com/", "date": "2026-04-02T06:56:01", "name": "cmpxchg: allow const-qualified old value in cmpxchg()", "commit_ref": null, "pull_url": null, "state": "handled-elsewhere", "archived": false, "hash": "b31881f285990c28536ad72719ef4c83f14b3e16", "submitter": { "id": 15639, "url": "http://patchwork.ozlabs.org/api/1.2/people/15639/?format=api", "name": "Hangbin Liu", "email": "liuhangbin@gmail.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260402-cmpxchg-v1-1-4561e2c05d2c@gmail.com/mbox/", "series": [ { "id": 498436, "url": "http://patchwork.ozlabs.org/api/1.2/series/498436/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=498436", "date": "2026-04-02T06:56:01", "name": "cmpxchg: allow const-qualified old value in cmpxchg()", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/498436/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2218945/comments/", "check": "fail", "checks": "http://patchwork.ozlabs.org/api/patches/2218945/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linuxppc-dev+bounces-19188-incoming=patchwork.ozlabs.org@lists.ozlabs.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linuxppc-dev@lists.ozlabs.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=UxMz6fL7;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; 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charset=\"utf-8\"", "Content-Transfer-Encoding": "7bit", "Message-Id": "<20260402-cmpxchg-v1-1-4561e2c05d2c@gmail.com>", "X-B4-Tracking": "v=1; b=H4sIAAAAAAAC/6tWKk4tykwtVrJSqFYqSi3LLM7MzwNyDHUUlJIzE\n vPSU3UzU4B8JSMDIzMDEwMj3eTcgorkjHRdo7QUYwPzNBOTRBNDJaDqgqLUtMwKsEnRsbW1AGI\n cTBRZAAAA", "X-Change-ID": "20260402-cmpxchg-2fd307f44a41", "To": "Richard Henderson <richard.henderson@linaro.org>,\n Matt Turner <mattst88@gmail.com>, Magnus Lindholm <linmag7@gmail.com>,\n Vineet Gupta <vgupta@kernel.org>, Brian Cain <bcain@kernel.org>,\n \"James E.J. Bottomley\" <James.Bottomley@HansenPartnership.com>,\n Helge Deller <deller@gmx.de>, Madhavan Srinivasan <maddy@linux.ibm.com>,\n Michael Ellerman <mpe@ellerman.id.au>, Nicholas Piggin <npiggin@gmail.com>,\n \"Christophe Leroy (CS GROUP)\" <chleroy@kernel.org>,\n Paul Walmsley <pjw@kernel.org>, Palmer Dabbelt <palmer@dabbelt.com>,\n Albert Ou <aou@eecs.berkeley.edu>, Alexandre Ghiti <alex@ghiti.fr>,\n Yoshinori Sato <ysato@users.sourceforge.jp>, Rich Felker <dalias@libc.org>,\n John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>,\n \"David S. Miller\" <davem@davemloft.net>,\n Andreas Larsson <andreas@gaisler.com>, Thomas Gleixner <tglx@kernel.org>,\n Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,\n Dave Hansen <dave.hansen@linux.intel.com>, x86@kernel.org,\n \"H. Peter Anvin\" <hpa@zytor.com>, Chris Zankel <chris@zankel.net>,\n Max Filippov <jcmvbkbc@gmail.com>", "Cc": "linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org,\n linux-snps-arc@lists.infradead.org, linux-hexagon@vger.kernel.org,\n linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,\n linux-riscv@lists.infradead.org, linux-sh@vger.kernel.org,\n sparclinux@vger.kernel.org, Jakub Kicinski <kuba@kernel.org>,\n Hangbin Liu <liuhangbin@gmail.com>", "X-Mailer": "b4 0.14.3", "X-Spam-Status": "No, score=-0.2 required=3.0 tests=DKIM_SIGNED,DKIM_VALID,\n\tDKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM,RCVD_IN_DNSWL_NONE,\n\tSPF_HELO_NONE,SPF_PASS autolearn=disabled version=4.0.1 OzLabs 8", "X-Spam-Checker-Version": "SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org" }, "content": "The old value passed to cmpxchg() is semantically read-only: it is\nonly loaded into a register as a comparand and is never written back.\nHowever, the macro currently assigns it implicitly to a local variable\nof type __typeof__(*(ptr)), which triggers -Werror=discarded-qualifiers\nwhen old is a const-qualified pointer and ptr points to a non-const type.\n\nTo avoid this, let's add an explicit cast to __typeof__(*(ptr)) for the\nold local variable in the cmpxchg macros. This explicit cast suppresses\nthe -Wdiscarded-qualifiers diagnostic.\n\nThe new value is intentionally left without a cast: new will be stored\ninto *ptr, so silently accepting a const-qualified new would allow\ncallers to store a pointer-to-const into a non-const location without\nany compiler warning.\n\nSuggested-by: Jakub Kicinski <kuba@kernel.org>\nSigned-off-by: Hangbin Liu <liuhangbin@gmail.com>\n---\nThis is my first time posting a patch with multi-architecture specific\nchanges, so I'm not sure which target repository I should use. Please\ncorrect me if I made any mistakes.\n---\n arch/alpha/include/asm/cmpxchg.h | 4 ++--\n arch/arc/include/asm/cmpxchg.h | 4 ++--\n arch/hexagon/include/asm/cmpxchg.h | 2 +-\n arch/parisc/include/asm/cmpxchg.h | 2 +-\n arch/powerpc/include/asm/cmpxchg.h | 8 ++++----\n arch/riscv/include/asm/cmpxchg.h | 4 ++--\n arch/sh/include/asm/cmpxchg.h | 2 +-\n arch/sparc/include/asm/cmpxchg_32.h | 2 +-\n arch/sparc/include/asm/cmpxchg_64.h | 2 +-\n arch/x86/include/asm/cmpxchg.h | 2 +-\n arch/xtensa/include/asm/cmpxchg.h | 2 +-\n tools/arch/x86/include/asm/cmpxchg.h | 2 +-\n 12 files changed, 18 insertions(+), 18 deletions(-)\n\n\n---\nbase-commit: 48b3cd69265f346f64b93064723492da46206e9b\nchange-id: 20260402-cmpxchg-2fd307f44a41\n\nBest regards,", "diff": "diff --git a/arch/alpha/include/asm/cmpxchg.h b/arch/alpha/include/asm/cmpxchg.h\nindex ae1b96479d0c..b4b8dac759c4 100644\n--- a/arch/alpha/include/asm/cmpxchg.h\n+++ b/arch/alpha/include/asm/cmpxchg.h\n@@ -234,7 +234,7 @@ ____cmpxchg(volatile void *ptr, unsigned long old, unsigned long new,\n \n #define arch_cmpxchg_local(ptr, o, n)\t\t\t\t\t\\\n ({\t\t\t\t\t\t\t\t\t\\\n-\t__typeof__(*(ptr)) _o_ = (o);\t\t\t\t\t\\\n+\t__typeof__(*(ptr)) _o_ = (__typeof__(*(ptr)))(o);\t\t\\\n \t__typeof__(*(ptr)) _n_ = (n);\t\t\t\t\t\\\n \t(__typeof__(*(ptr))) ____cmpxchg((ptr), (unsigned long)_o_,\t\\\n \t\t\t\t\t (unsigned long)_n_,\t\t\\\n@@ -265,7 +265,7 @@ ____cmpxchg(volatile void *ptr, unsigned long old, unsigned long new,\n #define arch_cmpxchg(ptr, o, n)\t\t\t\t\t\t\\\n ({\t\t\t\t\t\t\t\t\t\\\n \t__typeof__(*(ptr)) __ret;\t\t\t\t\t\\\n-\t__typeof__(*(ptr)) _o_ = (o);\t\t\t\t\t\\\n+\t__typeof__(*(ptr)) _o_ = (__typeof__(*(ptr)))(o);\t\t\\\n \t__typeof__(*(ptr)) _n_ = (n);\t\t\t\t\t\\\n \tsmp_mb();\t\t\t\t\t\t\t\\\n \t__ret = (__typeof__(*(ptr))) ____cmpxchg((ptr),\t\t\t\\\ndiff --git a/arch/arc/include/asm/cmpxchg.h b/arch/arc/include/asm/cmpxchg.h\nindex 76f43db0890f..9637e2cdb5b1 100644\n--- a/arch/arc/include/asm/cmpxchg.h\n+++ b/arch/arc/include/asm/cmpxchg.h\n@@ -42,7 +42,7 @@\n #define arch_cmpxchg_relaxed(ptr, old, new)\t\t\t\t\\\n ({\t\t\t\t\t\t\t\t\t\\\n \t__typeof__(ptr) _p_ = (ptr);\t\t\t\t\t\\\n-\t__typeof__(*(ptr)) _o_ = (old);\t\t\t\t\t\\\n+\t__typeof__(*(ptr)) _o_ = (__typeof__(*(ptr)))(old);\t\t\t\\\n \t__typeof__(*(ptr)) _n_ = (new);\t\t\t\t\t\\\n \t__typeof__(*(ptr)) _prev_;\t\t\t\t\t\\\n \t\t\t\t\t\t\t\t\t\\\n@@ -64,7 +64,7 @@\n #define arch_cmpxchg(ptr, old, new)\t\t\t\t \\\n ({\t\t\t\t\t\t\t\t\t\\\n \tvolatile __typeof__(ptr) _p_ = (ptr);\t\t\t\t\\\n-\t__typeof__(*(ptr)) _o_ = (old);\t\t\t\t\t\\\n+\t__typeof__(*(ptr)) _o_ = (__typeof__(*(ptr)))(old);\t\t\t\\\n \t__typeof__(*(ptr)) _n_ = (new);\t\t\t\t\t\\\n \t__typeof__(*(ptr)) _prev_;\t\t\t\t\t\\\n \tunsigned long __flags;\t\t\t\t\t\t\\\ndiff --git a/arch/hexagon/include/asm/cmpxchg.h b/arch/hexagon/include/asm/cmpxchg.h\nindex 9c58fb81f7fd..7e117964cb6b 100644\n--- a/arch/hexagon/include/asm/cmpxchg.h\n+++ b/arch/hexagon/include/asm/cmpxchg.h\n@@ -54,7 +54,7 @@ __arch_xchg(unsigned long x, volatile void *ptr, int size)\n #define arch_cmpxchg(ptr, old, new)\t\t\t\t\\\n ({\t\t\t\t\t\t\t\t\\\n \t__typeof__(ptr) __ptr = (ptr);\t\t\t\t\\\n-\t__typeof__(*(ptr)) __old = (old);\t\t\t\\\n+\t__typeof__(*(ptr)) __old = (__typeof__(*(ptr)))(old);\t\\\n \t__typeof__(*(ptr)) __new = (new);\t\t\t\\\n \t__typeof__(*(ptr)) __oldval = (__typeof__(*(ptr))) 0;\t\\\n \t\t\t\t\t\t\t\t\\\ndiff --git a/arch/parisc/include/asm/cmpxchg.h b/arch/parisc/include/asm/cmpxchg.h\nindex bf0a0f1189eb..2a87942227f8 100644\n--- a/arch/parisc/include/asm/cmpxchg.h\n+++ b/arch/parisc/include/asm/cmpxchg.h\n@@ -78,7 +78,7 @@ __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new_, int size)\n \n #define arch_cmpxchg(ptr, o, n)\t\t\t\t\t\t \\\n ({\t\t\t\t\t\t\t\t\t \\\n-\t__typeof__(*(ptr)) _o_ = (o);\t\t\t\t\t \\\n+\t__typeof__(*(ptr)) _o_ = (__typeof__(*(ptr)))(o);\t\t \\\n \t__typeof__(*(ptr)) _n_ = (n);\t\t\t\t\t \\\n \t(__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_,\t \\\n \t\t\t\t (unsigned long)_n_, sizeof(*(ptr))); \\\ndiff --git a/arch/powerpc/include/asm/cmpxchg.h b/arch/powerpc/include/asm/cmpxchg.h\nindex dbb50c06f0bf..36d113b13623 100644\n--- a/arch/powerpc/include/asm/cmpxchg.h\n+++ b/arch/powerpc/include/asm/cmpxchg.h\n@@ -698,7 +698,7 @@ __cmpxchg_acquire(void *ptr, unsigned long old, unsigned long new,\n }\n #define arch_cmpxchg(ptr, o, n)\t\t\t\t\t\t \\\n ({\t\t\t\t\t\t\t\t\t \\\n- __typeof__(*(ptr)) _o_ = (o);\t\t\t\t\t \\\n+ __typeof__(*(ptr)) _o_ = (__typeof__(*(ptr)))(o);\t\t\t \\\n __typeof__(*(ptr)) _n_ = (n);\t\t\t\t\t \\\n (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_,\t\t \\\n \t\t\t\t (unsigned long)_n_, sizeof(*(ptr))); \\\n@@ -707,7 +707,7 @@ __cmpxchg_acquire(void *ptr, unsigned long old, unsigned long new,\n \n #define arch_cmpxchg_local(ptr, o, n)\t\t\t\t\t \\\n ({\t\t\t\t\t\t\t\t\t \\\n- __typeof__(*(ptr)) _o_ = (o);\t\t\t\t\t \\\n+ __typeof__(*(ptr)) _o_ = (__typeof__(*(ptr)))(o);\t\t\t \\\n __typeof__(*(ptr)) _n_ = (n);\t\t\t\t\t \\\n (__typeof__(*(ptr))) __cmpxchg_local((ptr), (unsigned long)_o_,\t \\\n \t\t\t\t (unsigned long)_n_, sizeof(*(ptr))); \\\n@@ -715,7 +715,7 @@ __cmpxchg_acquire(void *ptr, unsigned long old, unsigned long new,\n \n #define arch_cmpxchg_relaxed(ptr, o, n)\t\t\t\t\t\\\n ({\t\t\t\t\t\t\t\t\t\\\n-\t__typeof__(*(ptr)) _o_ = (o);\t\t\t\t\t\\\n+\t__typeof__(*(ptr)) _o_ = (__typeof__(*(ptr)))(o);\t\t\\\n \t__typeof__(*(ptr)) _n_ = (n);\t\t\t\t\t\\\n \t(__typeof__(*(ptr))) __cmpxchg_relaxed((ptr),\t\t\t\\\n \t\t\t(unsigned long)_o_, (unsigned long)_n_,\t\t\\\n@@ -724,7 +724,7 @@ __cmpxchg_acquire(void *ptr, unsigned long old, unsigned long new,\n \n #define arch_cmpxchg_acquire(ptr, o, n)\t\t\t\t\t\\\n ({\t\t\t\t\t\t\t\t\t\\\n-\t__typeof__(*(ptr)) _o_ = (o);\t\t\t\t\t\\\n+\t__typeof__(*(ptr)) _o_ = (__typeof__(*(ptr)))(o);\t\t\\\n \t__typeof__(*(ptr)) _n_ = (n);\t\t\t\t\t\\\n \t(__typeof__(*(ptr))) __cmpxchg_acquire((ptr),\t\t\t\\\n \t\t\t(unsigned long)_o_, (unsigned long)_n_,\t\t\\\ndiff --git a/arch/riscv/include/asm/cmpxchg.h b/arch/riscv/include/asm/cmpxchg.h\nindex 8712cf9c69dc..3026a9ff43c4 100644\n--- a/arch/riscv/include/asm/cmpxchg.h\n+++ b/arch/riscv/include/asm/cmpxchg.h\n@@ -215,7 +215,7 @@\n \t\t cas_prepend, cas_append)\t\t\t\t\\\n ({\t\t\t\t\t\t\t\t\t\\\n \t__typeof__(ptr) __ptr = (ptr);\t\t\t\t\t\\\n-\t__typeof__(*(__ptr)) __old = (old);\t\t\t\t\\\n+\t__typeof__(*(__ptr)) __old = (__typeof__(*(__ptr)))(old);\t\\\n \t__typeof__(*(__ptr)) __new = (new);\t\t\t\t\\\n \t__typeof__(*(__ptr)) __ret;\t\t\t\t\t\\\n \t\t\t\t\t\t\t\t\t\\\n@@ -331,7 +331,7 @@ union __u128_halves {\n \n #define __arch_cmpxchg128(p, o, n, cas_sfx)\t\t\t\t\t\\\n ({\t\t\t\t\t\t\t\t\t\t\\\n-\t__typeof__(*(p)) __o = (o); \\\n+\t__typeof__(*(p)) __o = (__typeof__(*(p)))(o); \\\n \tunion __u128_halves __hn = { .full = (n) };\t\t\t\t\\\n \tunion __u128_halves __ho = { .full = (__o) };\t\t\t\t\\\n \tregister unsigned long t1 asm (\"t1\") = __hn.low;\t\t\t\\\ndiff --git a/arch/sh/include/asm/cmpxchg.h b/arch/sh/include/asm/cmpxchg.h\nindex 1e5dc5ccf7bf..7fb9214d246f 100644\n--- a/arch/sh/include/asm/cmpxchg.h\n+++ b/arch/sh/include/asm/cmpxchg.h\n@@ -68,7 +68,7 @@ static inline unsigned long __cmpxchg(volatile void * ptr, unsigned long old,\n \n #define arch_cmpxchg(ptr,o,n)\t\t\t\t\t\t \\\n ({\t\t\t\t\t\t\t\t\t \\\n- __typeof__(*(ptr)) _o_ = (o);\t\t\t\t\t \\\n+ __typeof__(*(ptr)) _o_ = (__typeof__(*(ptr)))(o);\t\t\t \\\n __typeof__(*(ptr)) _n_ = (n);\t\t\t\t\t \\\n (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_,\t\t \\\n \t\t\t\t (unsigned long)_n_, sizeof(*(ptr))); \\\ndiff --git a/arch/sparc/include/asm/cmpxchg_32.h b/arch/sparc/include/asm/cmpxchg_32.h\nindex 8c1a3ca34eeb..f733bd5b5d3b 100644\n--- a/arch/sparc/include/asm/cmpxchg_32.h\n+++ b/arch/sparc/include/asm/cmpxchg_32.h\n@@ -55,7 +55,7 @@ __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new_, int size)\n \n #define arch_cmpxchg(ptr, o, n)\t\t\t\t\t\t\\\n ({\t\t\t\t\t\t\t\t\t\\\n-\t__typeof__(*(ptr)) _o_ = (o);\t\t\t\t\t\\\n+\t__typeof__(*(ptr)) _o_ = (__typeof__(*(ptr)))(o);\t\t\\\n \t__typeof__(*(ptr)) _n_ = (n);\t\t\t\t\t\\\n \t(__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_,\t\\\n \t\t\t(unsigned long)_n_, sizeof(*(ptr)));\t\t\\\ndiff --git a/arch/sparc/include/asm/cmpxchg_64.h b/arch/sparc/include/asm/cmpxchg_64.h\nindex 3de25262c411..4a9ccf80487a 100644\n--- a/arch/sparc/include/asm/cmpxchg_64.h\n+++ b/arch/sparc/include/asm/cmpxchg_64.h\n@@ -170,7 +170,7 @@ __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)\n \n #define arch_cmpxchg(ptr,o,n)\t\t\t\t\t\t \\\n ({\t\t\t\t\t\t\t\t\t \\\n- __typeof__(*(ptr)) _o_ = (o);\t\t\t\t\t \\\n+ __typeof__(*(ptr)) _o_ = (__typeof__(*(ptr)))(o);\t\t\t \\\n __typeof__(*(ptr)) _n_ = (n);\t\t\t\t\t \\\n (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_,\t\t \\\n \t\t\t\t (unsigned long)_n_, sizeof(*(ptr))); \\\ndiff --git a/arch/x86/include/asm/cmpxchg.h b/arch/x86/include/asm/cmpxchg.h\nindex a88b06f1c35e..a7984842c58a 100644\n--- a/arch/x86/include/asm/cmpxchg.h\n+++ b/arch/x86/include/asm/cmpxchg.h\n@@ -85,7 +85,7 @@ extern void __add_wrong_size(void)\n #define __raw_cmpxchg(ptr, old, new, size, lock)\t\t\t\\\n ({\t\t\t\t\t\t\t\t\t\\\n \t__typeof__(*(ptr)) __ret;\t\t\t\t\t\\\n-\t__typeof__(*(ptr)) __old = (old);\t\t\t\t\\\n+\t__typeof__(*(ptr)) __old = (__typeof__(*(ptr)))(old);\t\t\\\n \t__typeof__(*(ptr)) __new = (new);\t\t\t\t\\\n \tswitch (size) {\t\t\t\t\t\t\t\\\n \tcase __X86_CASE_B:\t\t\t\t\t\t\\\ndiff --git a/arch/xtensa/include/asm/cmpxchg.h b/arch/xtensa/include/asm/cmpxchg.h\nindex b6db4838b175..0f68eddb6d2d 100644\n--- a/arch/xtensa/include/asm/cmpxchg.h\n+++ b/arch/xtensa/include/asm/cmpxchg.h\n@@ -83,7 +83,7 @@ __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)\n }\n \n #define arch_cmpxchg(ptr,o,n)\t\t\t\t\t\t \\\n-\t({ __typeof__(*(ptr)) _o_ = (o);\t\t\t\t \\\n+\t({ __typeof__(*(ptr)) _o_ = (__typeof__(*(ptr)))(o);\t\t \\\n \t __typeof__(*(ptr)) _n_ = (n);\t\t\t\t \\\n \t (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_,\t \\\n \t \t\t\t (unsigned long)_n_, sizeof (*(ptr))); \\\ndiff --git a/tools/arch/x86/include/asm/cmpxchg.h b/tools/arch/x86/include/asm/cmpxchg.h\nindex 0ed9ca2766ad..b71938db9422 100644\n--- a/tools/arch/x86/include/asm/cmpxchg.h\n+++ b/tools/arch/x86/include/asm/cmpxchg.h\n@@ -35,7 +35,7 @@ extern void __cmpxchg_wrong_size(void)\n #define __raw_cmpxchg(ptr, old, new, size, lock)\t\t\t\\\n ({\t\t\t\t\t\t\t\t\t\\\n \t__typeof__(*(ptr)) __ret;\t\t\t\t\t\\\n-\t__typeof__(*(ptr)) __old = (old);\t\t\t\t\\\n+\t__typeof__(*(ptr)) __old = (__typeof__(*(ptr)))(old);\t\t\\\n \t__typeof__(*(ptr)) __new = (new);\t\t\t\t\\\n \tswitch (size) {\t\t\t\t\t\t\t\\\n \tcase __X86_CASE_B:\t\t\t\t\t\t\\\n", "prefixes": [] }