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linux-yocto/6.12: libbpf: silence maybe-uninitialized warning from clang

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Integrating the following commit(s) to linux-yocto/6.12:

1/1 [
    Author: Ross Burton
    Email: ross.burton@arm.com
    Subject: libbpf: silence maybe-uninitialized warning from clang
    Date: Wed, 4 Jun 2025 21:22:23 +0100

    perf is build with -Werror, but clang 20.1.6 (incorrectly) finds that
    mod_len may be used uninitialized:

    libbpf.c: In function 'find_kernel_btf_id.constprop':
    libbpf.c:10009:33: error: 'mod_len' may be used uninitialized [-Werror=maybe-uninitialized]
    10009 |                 if (mod_name && strncmp(mod->name, mod_name, mod_len) != 0)
          |                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    libbpf.c:9979:21: note: 'mod_len' was declared here
     9979 |         int ret, i, mod_len;
          |                     ^~~~~~~

    Inspecting the code it can be seen that mod_len is set if mod_name is
    set, and the strncmp() is only called if mod_name is set, so this is a
    false positive (interestingly, clang doesn't spot the same issue above).

    Silence the false positive by explicitly initializing mod_len to 0.

    Signed-off-by: Ross Burton <ross.burton@arm.com>
    Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
]

(From OE-Core rev: 0454186eeceafb8e0bd2b29ac2f8b46f9601f65d)

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 43f6b7795170f0e571265f22bcef51554684206f)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
This commit is contained in:
Bruce Ashfield
2025-06-04 22:18:55 -04:00
committed by Steve Sakoman
parent 24c2877b84
commit eed129272d
3 changed files with 16 additions and 16 deletions
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meta/recipes-kernel/linux/linux-yocto-rt_6.12.bb
+2 -2
View File
@@ -14,8 +14,8 @@ python () {
raise bb.parse.SkipRecipe("Set PREFERRED_PROVIDER_virtual/kernel to linux-yocto-rt to enable it")
}
SRCREV_machine ?= "4127c6137af28c2c91ec79acee60fe4d4d70db9b"
SRCREV_meta ?= "f2f3b6cbd91743920e2cb55998c53326855b2e9c"
SRCREV_machine ?= "7cb6d42c40de351ecab0a083aef260f84407de0d"
SRCREV_meta ?= "60b8562e9989f268ad5d241989f56b71cfa1f648"
SRC_URI = "git://git.yoctoproject.org/linux-yocto.git;branch=${KBRANCH};name=machine;protocol=https \
git://git.yoctoproject.org/yocto-kernel-cache;type=kmeta;name=meta;branch=yocto-6.12;destsuffix=${KMETA};protocol=https"