On Thu, Jan 07, 2021 at 01:20:55PM +0000, Alexander Lobakin wrote: > When building kernel with LD_DEAD_CODE_DATA_ELIMINATION, LLVM stack > generates separate sections for compound literals, just like in case > with enabled LTO [0]: > > ld.lld: warning: drivers/built-in.a(mtd/nand/spi/gigadevice.o): > (.data..compoundliteral.14) is being placed in > '.data..compoundliteral.14' > ld.lld: warning: drivers/built-in.a(mtd/nand/spi/gigadevice.o): > (.data..compoundliteral.15) is being placed in > '.data..compoundliteral.15' > ld.lld: warning: drivers/built-in.a(mtd/nand/spi/gigadevice.o): > (.data..compoundliteral.16) is being placed in > '.data..compoundliteral.16' > ld.lld: warning: drivers/built-in.a(mtd/nand/spi/gigadevice.o): > (.data..compoundliteral.17) is being placed in > '.data..compoundliteral.17' > > [...] > > Handle this by adding the related sections to generic definitions > as suggested by Sami [0]. > > [0] > https://lore.kernel.org/lkml/[email protected] > > Suggested-by: Kees Cook <[email protected]> > Signed-off-by: Alexander Lobakin <[email protected]>
Reviewed-by: Nathan Chancellor <[email protected]> > --- > include/asm-generic/vmlinux.lds.h | 6 +++--- > 1 file changed, 3 insertions(+), 3 deletions(-) > > diff --git a/include/asm-generic/vmlinux.lds.h > b/include/asm-generic/vmlinux.lds.h > index b2b3d81b1535..5f2f5b1db84f 100644 > --- a/include/asm-generic/vmlinux.lds.h > +++ b/include/asm-generic/vmlinux.lds.h > @@ -95,10 +95,10 @@ > */ > #ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION > #define TEXT_MAIN .text .text.[0-9a-zA-Z_]* > -#define DATA_MAIN .data .data.[0-9a-zA-Z_]* .data..LPBX* > +#define DATA_MAIN .data .data.[0-9a-zA-Z_]* .data..L* .data..compoundliteral* > #define SDATA_MAIN .sdata .sdata.[0-9a-zA-Z_]* > -#define RODATA_MAIN .rodata .rodata.[0-9a-zA-Z_]* > -#define BSS_MAIN .bss .bss.[0-9a-zA-Z_]* > +#define RODATA_MAIN .rodata .rodata.[0-9a-zA-Z_]* .rodata..L* > +#define BSS_MAIN .bss .bss.[0-9a-zA-Z_]* .bss..compoundliteral* > #define SBSS_MAIN .sbss .sbss.[0-9a-zA-Z_]* > #else > #define TEXT_MAIN .text > -- > 2.30.0 > >
