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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-tiny_6.12.bb
+2 -2
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@@ -17,8 +17,8 @@ DEPENDS += "openssl-native util-linux-native"
KMETA = "kernel-meta"
KCONF_BSP_AUDIT_LEVEL = "2"
SRCREV_machine ?= "fee8195f8412ff8f1bfc50ba86cdb8f20de22750"
SRCREV_meta ?= "f2f3b6cbd91743920e2cb55998c53326855b2e9c"
SRCREV_machine ?= "298aefdf4112e7c0a84522e4acf2c722e433c8a0"
SRCREV_meta ?= "60b8562e9989f268ad5d241989f56b71cfa1f648"
PV = "${LINUX_VERSION}+git"