| Message ID | 20200804005410.146094-7-oohall@gmail.com (mailing list archive) |
|---|---|
| State | Accepted |
| Commit | 3ced132a055c4e5046d21732393ae6848ff309e0 |
| Headers | show |
| Series | [1/6] powerpc/powernv/smp: Fix spurious DBG() warning | expand |
| Context | Check | Description |
|---|---|---|
| snowpatch_ozlabs/apply_patch | success | Successfully applied on branch powerpc/merge (14fd53d1e5ee7350564cac75e336f8c0dea13bc9) |
| snowpatch_ozlabs/build-ppc64le | warning | Upstream build failed, couldn't test patch |
| snowpatch_ozlabs/build-ppc64be | warning | Upstream build failed, couldn't test patch |
| snowpatch_ozlabs/build-ppc64e | warning | Upstream build failed, couldn't test patch |
| snowpatch_ozlabs/build-pmac32 | warning | Upstream build failed, couldn't test patch |
| snowpatch_ozlabs/checkpatch | success | total: 0 errors, 0 warnings, 0 checks, 18 lines checked |
| snowpatch_ozlabs/needsstable | success | Patch has no Fixes tags |
diff --git a/arch/powerpc/include/asm/icswx.h b/arch/powerpc/include/asm/icswx.h index b0c70a35fd0e..f6599ccb3012 100644 --- a/arch/powerpc/include/asm/icswx.h +++ b/arch/powerpc/include/asm/icswx.h @@ -156,8 +156,7 @@ struct coprocessor_request_block { u8 reserved[32]; struct coprocessor_status_block csb; -} __packed; - +} __aligned(128); /* RFC02167 Initiate Coprocessor Instructions document * Chapter 8.2.1.1.1 RS @@ -188,6 +187,9 @@ static inline int icswx(__be32 ccw, struct coprocessor_request_block *crb) __be64 ccw_reg = ccw; u32 cr; + /* NB: the same structures are used by VAS-NX */ + BUILD_BUG_ON(sizeof(*crb) != 128); + __asm__ __volatile__( PPC_ICSWX(%1,0,%2) "\n" "mfcr %0\n"
Building with W=1 results in the following warning: In file included from arch/powerpc/platforms/powernv/vas-fault.c:16: ./arch/powerpc/include/asm/icswx.h:159:1: error: alignment 1 of ‘struct coprocessor_request_block’ is less than 16 [-Werror=packed-not-aligned] 159 | } __packed; | ^ ./arch/powerpc/include/asm/icswx.h:159:1: error: alignment 1 of ‘struct coprocessor_request_block’ is less than 16 [-Werror=packed-not-aligned] ./arch/powerpc/include/asm/icswx.h:159:1: error: alignment 1 of ‘struct coprocessor_request_block’ is less than 16 [-Werror=packed-not-aligned] ./arch/powerpc/include/asm/icswx.h:159:1: error: alignment 1 of ‘struct coprocessor_request_block’ is less than 16 [-Werror=packed-not-aligned] cc1: all warnings being treated as errors This happens because coprocessor_request_block includes several sub-structures with an alignment specified using the __aligned(XX) attribute. The problem comes from coprocessor_request_block having the __packed attribute. Packing the structure causes the preferred alignment of the nested structures to be ignored and we get the warnings as a result. This isn't a problem in practice since the struct is defined with explicit padding in the form of reserved fields, but we'd like to get rid of the spurious warnings. The simplest solution is to remove the packed attribute and use a BUILD_BUG_ON() to ensure the struct is the correct (expected by HW) size compile time. Also add a __aligned(128) to the request block structure since Book4 for P8 suggests the HW requires it to be aligned to a 128 byte boundary. There's a similar requirement for P9 since the COPY and PASTE instructions used to invoke VAS/NX accelerators operates on a cache line boundary. Cc: Dan Streetman <ddstreet@ieee.org> Cc: Haren Myneni <haren@linux.vnet.ibm.com> Signed-off-by: Oliver O'Halloran <oohall@gmail.com> --- arch/powerpc/include/asm/icswx.h | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)