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Message-ID: <CADVatmO9XzFnX+N0TuOtr0FYyxKr1oe5RAhCEJjmnvjteT5QNw@mail.gmail.com> Date: Sun, 17 Jul 2022 10:12:42 +0100 From: Sudip Mukherjee <sudipm.mukherjee@...il.com> To: Michael Ellerman <mpe@...erman.id.au>, Benjamin Herrenschmidt <benh@...nel.crashing.org>, Paul Mackerras <paulus@...ba.org>, Kees Cook <keescook@...omium.org> Cc: linuxppc-dev@...ts.ozlabs.org, linux-kernel <linux-kernel@...r.kernel.org>, linux-hardening@...r.kernel.org, Linus Torvalds <torvalds@...ux-foundation.org> Subject: Re: mainline build failure of powerpc allmodconfig for prom_init_check On Thu, Jul 14, 2022 at 9:55 AM Sudip Mukherjee (Codethink) <sudipm.mukherjee@...il.com> wrote: > > Hi All, > > Not sure if it has been reported before but the latest mainline kernel > branch fails to build for powerpc allmodconfig with gcc-12 and the error is: > > Error: External symbol 'memset' referenced from prom_init.c > make[2]: *** [arch/powerpc/kernel/Makefile:204: arch/powerpc/kernel/prom_init_check] Error 1 I was trying to check it. With gcc-11 the assembly code generated is not using memset, but using __memset. But with gcc-12, I can see the assembly code is using memset. One example from the assembly: call_prom: .quad .call_prom,.TOC.@...base,0 .previous .size call_prom,24 .type .call_prom,@function .call_prom: mflr 0 #, std 29,-24(1) #, std 30,-16(1) #, std 31,-8(1) #, mr 29,3 # tmp166, service mr 31,4 # nargs, tmp167 mr 30,5 # tmp168, nret # arch/powerpc/kernel/prom_init.c:396: struct prom_args args; li 4,254 #, li 5,52 #, # arch/powerpc/kernel/prom_init.c:394: { std 0,16(1) #, stdu 1,-208(1) #,, # arch/powerpc/kernel/prom_init.c:396: struct prom_args args; addi 3,1,112 # tmp174,, # arch/powerpc/kernel/prom_init.c:394: { std 9,304(1) #, std 10,312(1) #, std 6,280(1) #, std 7,288(1) #, std 8,296(1) #, # arch/powerpc/kernel/prom_init.c:396: struct prom_args args; bl .memset # nop rldicl 9,31,0,32 # nargs, nargs addi 9,9,1 # tmp163, nargs, mtctr 9 # tmp163, tmp163 -- Regards Sudip
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