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{
    "id": 810251,
    "url": "http://patchwork.ozlabs.org/api/1.2/patches/810251/?format=api",
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        "id": 7,
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        "name": "Linux network development",
        "link_name": "netdev",
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    "msgid": "<1504637190.15310.62.camel@edumazet-glaptop3.roam.corp.google.com>",
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    "date": "2017-09-05T18:46:30",
    "name": "[v2] radix-tree: must check __radix_tree_preload() return value",
    "commit_ref": null,
    "pull_url": null,
    "state": "not-applicable",
    "archived": true,
    "hash": "26cc766cfe9a1a3d4dbbebfb15c063942a627182",
    "submitter": {
        "id": 2404,
        "url": "http://patchwork.ozlabs.org/api/1.2/people/2404/?format=api",
        "name": "Eric Dumazet",
        "email": "eric.dumazet@gmail.com"
    },
    "delegate": {
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        "url": "http://patchwork.ozlabs.org/api/1.2/users/34/?format=api",
        "username": "davem",
        "first_name": "David",
        "last_name": "Miller",
        "email": "davem@davemloft.net"
    },
    "mbox": "http://patchwork.ozlabs.org/project/netdev/patch/1504637190.15310.62.camel@edumazet-glaptop3.roam.corp.google.com/mbox/",
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        {
            "id": 1629,
            "url": "http://patchwork.ozlabs.org/api/1.2/series/1629/?format=api",
            "web_url": "http://patchwork.ozlabs.org/project/netdev/list/?series=1629",
            "date": "2017-09-05T18:46:30",
            "name": "[v2] radix-tree: must check __radix_tree_preload() return value",
            "version": 2,
            "mbox": "http://patchwork.ozlabs.org/series/1629/mbox/"
        }
    ],
    "comments": "http://patchwork.ozlabs.org/api/patches/810251/comments/",
    "check": "pending",
    "checks": "http://patchwork.ozlabs.org/api/patches/810251/checks/",
    "tags": {},
    "related": [],
    "headers": {
        "Return-Path": "<netdev-owner@vger.kernel.org>",
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        "Message-ID": "<1504637190.15310.62.camel@edumazet-glaptop3.roam.corp.google.com>",
        "Subject": "[PATCH v2] radix-tree: must check __radix_tree_preload() return\n\tvalue",
        "From": "Eric Dumazet <eric.dumazet@gmail.com>",
        "To": "Matthew Wilcox <willy@infradead.org>",
        "Cc": "Matthew Wilcox <mawilcox@microsoft.com>,\n\t\"Kirill A. Shutemov\" <kirill.shutemov@linux.intel.com>,\n\tAndrew Morton <akpm@linux-foundation.org>,\n\tnetdev <netdev@vger.kernel.org>,\n\tLinus Torvalds <torvalds@linux-foundation.org>,\n\tlinux-kernel <linux-kernel@vger.kernel.org>",
        "Date": "Tue, 05 Sep 2017 11:46:30 -0700",
        "In-Reply-To": "<1504634367.15310.59.camel@edumazet-glaptop3.roam.corp.google.com>",
        "References": "<1504634367.15310.59.camel@edumazet-glaptop3.roam.corp.google.com>",
        "Content-Type": "text/plain; charset=\"UTF-8\"",
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        "Sender": "netdev-owner@vger.kernel.org",
        "Precedence": "bulk",
        "List-ID": "<netdev.vger.kernel.org>",
        "X-Mailing-List": "netdev@vger.kernel.org"
    },
    "content": "From: Eric Dumazet <edumazet@google.com>\n\n__radix_tree_preload() only disables preemption if no error is returned.\n\nSo we really need to make sure callers always check the return value.\n\nidr_preload() contract is to always disable preemption, so we need\nto add a missing preempt_disable() if an error happened.\n\nSimilarly, ida_pre_get() only needs to call preempt_enable() in the\ncase no error happened.\n\nFixes: 0a835c4f090a (\"Reimplement IDR and IDA using the radix tree\")\nFixes: 7ad3d4d85c7a (\"ida: Move ida_bitmap to a percpu variable\")\nSigned-off-by: Eric Dumazet <edumazet@google.com>\nCc: <stable@vger.kernel.org>    [4.11+]\n---\nv2: addressed Linus feedback, not adding useless/confusing 'ret' variables.\n\n lib/radix-tree.c |    9 +++++----\n 1 file changed, 5 insertions(+), 4 deletions(-)",
    "diff": "diff --git a/lib/radix-tree.c b/lib/radix-tree.c\nindex 3527eb364964..afb3cb4d44b6 100644\n--- a/lib/radix-tree.c\n+++ b/lib/radix-tree.c\n@@ -463,7 +463,7 @@ radix_tree_node_free(struct radix_tree_node *node)\n  * To make use of this facility, the radix tree must be initialised without\n  * __GFP_DIRECT_RECLAIM being passed to INIT_RADIX_TREE().\n  */\n-static int __radix_tree_preload(gfp_t gfp_mask, unsigned nr)\n+static __must_check int __radix_tree_preload(gfp_t gfp_mask, unsigned nr)\n {\n \tstruct radix_tree_preload *rtp;\n \tstruct radix_tree_node *node;\n@@ -2104,7 +2104,8 @@ EXPORT_SYMBOL(radix_tree_tagged);\n  */\n void idr_preload(gfp_t gfp_mask)\n {\n-\t__radix_tree_preload(gfp_mask, IDR_PRELOAD_SIZE);\n+\tif (__radix_tree_preload(gfp_mask, IDR_PRELOAD_SIZE))\n+\t\tpreempt_disable();\n }\n EXPORT_SYMBOL(idr_preload);\n \n@@ -2118,13 +2119,13 @@ EXPORT_SYMBOL(idr_preload);\n  */\n int ida_pre_get(struct ida *ida, gfp_t gfp)\n {\n-\t__radix_tree_preload(gfp, IDA_PRELOAD_SIZE);\n \t/*\n \t * The IDA API has no preload_end() equivalent.  Instead,\n \t * ida_get_new() can return -EAGAIN, prompting the caller\n \t * to return to the ida_pre_get() step.\n \t */\n-\tpreempt_enable();\n+\tif (!__radix_tree_preload(gfp, IDA_PRELOAD_SIZE))\n+\t\tpreempt_enable();\n \n \tif (!this_cpu_read(ida_bitmap)) {\n \t\tstruct ida_bitmap *bitmap = kmalloc(sizeof(*bitmap), gfp);\n",
    "prefixes": [
        "v2"
    ]
}