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Commit 6dd356d8 authored by Vineet Gupta's avatar Vineet Gupta
Browse files

ARC: unaligned: relax the check for gcc supporting -mno-unaligned-access 



Without bleeding edge gcc, kernel builds were tripping everywhere.

So current gcc will generate unaligned code despite
!CONFIG_ARC_USE_UNALIGNED_MEM_ACCESS but that is something we have to
live with.

Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
parent 85d6adcb

arch/arc/kernel/setup.c

+0 −12
Original line number Diff line number Diff line
@@ -314,18 +314,6 @@ static char *arc_cpu_mumbojumbo(int cpu_id, char *buf, int len) 
		       IS_AVAIL1(cpu->extn_mpy.ver, mpy_opt),

		       IS_AVAIL1(cpu->isa.div_rem, "div_rem "));





#if defined(__ARC_UNALIGNED__) && !defined(CONFIG_ARC_USE_UNALIGNED_MEM_ACCESS)

	/*

	 * gcc 7.3.1 (GNU 2018.03) onwards generate unaligned access by default

	 * but -mno-unaligned-access to disable that didn't work until gcc 8.2.1

	 * (GNU 2019.03). So landing here implies the interim period, when

	 * despite Kconfig being off, gcc is generating unaligned accesses which

	 * could bomb later on. So better to disallow such broken builds

	 */

	BUILD_BUG_ON_MSG(1, "gcc doesn't support -mno-unaligned-access");

#endif



	if (cpu->bpu.ver) {

		n += scnprintf(buf + n, len - n,

			      "BPU\t\t: %s%s match, cache:%d, Predict Table:%d Return stk: %d",