linux-kernel - Re: [PATCH] tools headers arm64: Fix compilation failure

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Date:   Thu, 11 Aug 2022 20:48:25 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Suzuki K Poulose <suzuki.poulose@....com>
Cc:     Arnaldo Carvalho de Melo <acme@...hat.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Will Deacon <will@...nel.org>,
        James Morse <james.morse@....com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tools headers arm64: Fix compilation failure

Hi Suzuki,

On Thu, Aug 11, 2022 at 11:11:41AM +0100, Suzuki Kuruppassery Poulose wrote:
> Hi Leo
> 
> On 11/08/2022 05:43, Leo Yan wrote:
> > When build perf tool on x86_64, it reports failure for finding the
> > header <asm/sysreg.h>:
> > 
> 
> Please could you mention the exact build options used for the perf
> build ? (e.g, enable SPE)

Sure, yeah, I encoutered the building failure after I applied the
patch set; the first patch is to change Arm SPE code in perf.
https://lore.kernel.org/lkml/20220811062451.435810-1-leo.yan@linaro.org/

> >    In file included from util/arm-spe.c:37:
> >    util/../../arch/arm64/include/asm/cputype.h:183:10: fatal error: asm/sysreg.h: No such file or directory
> >      183 | #include <asm/sysreg.h>
> >          |          ^~~~~~~~~~~~~~
> >    compilation terminated.
> >  > There have no sysreg.h in x86's asm folder, alternatively, this patch
> > includes the sysreg.h header in the same folder with cputype.h to fix
> > the compilation failure.
> 
> Wondering how the "cputype.h" was picked up from arch/arm64/include/ and
> why not the sysreg.h ? Ideally, we would like to pickup the kernel
> headers as it is without having to manually fixup, things like this.

Actually cputype.h and sysreg.h both are copied from arch/arm64/include/
and they are placed under tools/arch/arm64/include/asm/.

> > Fixes: 37402d5d061b ("tools headers arm64: Sync arm64's cputype.h with the kernel sources")
> 
> Also from the above commit,
> 
> "That addresses this perf build warning:
> 
>       Warning: Kernel ABI header at 'tools/arch/arm64/include/asm/cputype.h'
> differs from latest version at 'arch/arm64/include/asm/cputype.h'
>       diff -u tools/arch/arm64/include/asm/cputype.h
> arch/arm64/include/asm/cputype.h
> "
> 
> Wouldn't we re-introduce the warning back ?

Good point!  Thanks for pointing out this.  So I think another option
is to tweak the CFLGAS for arm-spe.c.  The change is as below.

I will send patch out a bit later in today, please let me know if this
is fine for you?  Thanks!

diff --git a/tools/perf/util/Build b/tools/perf/util/Build
index d8fe514c9ec9..9dfae1bda9cc 100644
--- a/tools/perf/util/Build
+++ b/tools/perf/util/Build
@@ -289,6 +289,7 @@ CFLAGS_hweight.o       += -Wno-unused-parameter -DETC_PERFCONFIG="BUILD_STR($(ET
 CFLAGS_parse-events.o  += -Wno-redundant-decls
 CFLAGS_expr.o          += -Wno-redundant-decls
 CFLAGS_header.o        += -include $(OUTPUT)PERF-VERSION-FILE
+CFLAGS_arm-spe.o       += -I$(srctree)/tools/arch/arm64/include/
 
 $(OUTPUT)util/kallsyms.o: ../lib/symbol/kallsyms.c FORCE
        $(call rule_mkdir)