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Contemporary kernels and modules can be relatively large, especially when common debug options are enabled. Using GCC 12.1.0, a v6.3-rc7 defconfig kernel is ~38M, and with PROVE_LOCKING + KASAN_INLINE enabled this expands to ~117M. Shanker reports [1] that the NVIDIA GPU driver alone can consume 110M of module space in some configurations. Both KASLR and ARM64_ERRATUM_843419 select MODULE_PLTS, so anyone wanting a kernel to have KASLR or run on Cortex-A53 will have MODULE_PLTS selected. This is the case in defconfig and distribution kernels (e.g. Debian, Android, etc). Practically speaking, this means we're very likely to need MODULE_PLTS and while it's almost guaranteed that MODULE_PLTS will be selected, it is possible to disable support, and we have to maintain some awkward special cases for such unusual configurations. This patch removes the MODULE_PLTS config option, with the support code always enabled if MODULES is selected. This results in a slight simplification, and will allow for further improvement in subsequent patches. For any config which currently selects MODULE_PLTS, there will be no functional change as a result of this patch. [1] https://lore.kernel.org/linux-arm-kernel/159ceeab-09af-3174-5058-445bc8dcf85b@nvidia.com/ Signed-off-by: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Ard Biesheuvel <ardb@kernel.org> Cc: Shanker Donthineni <sdonthineni@nvidia.com> Cc: Will Deacon <will@kernel.org> Tested-by: Shanker Donthineni <sdonthineni@nvidia.com> Link: https://lore.kernel.org/r/20230530110328.2213762-6-mark.rutland@arm.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
27 lines
795 B
C
27 lines
795 B
C
SECTIONS {
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.plt 0 : { BYTE(0) }
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.init.plt 0 : { BYTE(0) }
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.text.ftrace_trampoline 0 : { BYTE(0) }
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#ifdef CONFIG_KASAN_SW_TAGS
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/*
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* Outlined checks go into comdat-deduplicated sections named .text.hot.
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* Because they are in comdats they are not combined by the linker and
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* we otherwise end up with multiple sections with the same .text.hot
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* name in the .ko file. The kernel module loader warns if it sees
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* multiple sections with the same name so we use this sections
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* directive to force them into a single section and silence the
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* warning.
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*/
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.text.hot : { *(.text.hot) }
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#endif
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#ifdef CONFIG_UNWIND_TABLES
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/*
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* Currently, we only use unwind info at module load time, so we can
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* put it into the .init allocation.
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*/
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.init.eh_frame : { *(.eh_frame) }
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#endif
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}
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