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powerpc/ftrace: Fix dropping weak symbols with older toolchains
commitf6834c8c59
upstream. The minimum level of gcc supported for building the kernel is v5.1. v5.x releases of gcc emitted a three instruction sequence for -mprofile-kernel: mflr r0 std r0, 16(r1) bl _mcount It is only with the v6.x releases that gcc started emitting the two instruction sequence for -mprofile-kernel, omitting the second store instruction. With the older three instruction sequence, the actual ftrace location can be the 5th instruction into a function. Update the allowed offset for ftrace location from 12 to 16 to accommodate the same. Cc: stable@vger.kernel.org Fixes:7af82ff90a
("powerpc/ftrace: Ignore weak functions") Signed-off-by: Naveen N Rao <naveen@kernel.org> Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://msgid.link/7b265908a9461e38fc756ef9b569703860a80621.1687166935.git.naveen@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -12,7 +12,7 @@
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/* Ignore unused weak functions which will have larger offsets */
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#ifdef CONFIG_MPROFILE_KERNEL
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#define FTRACE_MCOUNT_MAX_OFFSET 12
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#define FTRACE_MCOUNT_MAX_OFFSET 16
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#elif defined(CONFIG_PPC32)
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#define FTRACE_MCOUNT_MAX_OFFSET 8
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#endif
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