p71924506
/
linux_old1
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

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: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Vineet Gupta 2019-03-05 09:16:29 -08:00
parent 85d6adcbbe
commit 6dd356d8fc
1 changed files with 0 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
arch/arc/kernel/setup.c
View File

@ -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",