linux-kernel - [PATCH AUTOSEL 4.4 2/3] hexagon: work around compiler crash

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Message-Id: <20200110220739.28883-2-sashal@kernel.org>
Date:   Fri, 10 Jan 2020 17:07:38 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Sid Manning <sidneym@...cinc.com>,
        Brian Cain <bcain@...eaurora.org>,
        Allison Randal <allison@...utok.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Richard Fontana <rfontana@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Sasha Levin <sashal@...nel.org>, linux-hexagon@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: [PATCH AUTOSEL 4.4 2/3] hexagon: work around compiler crash

From: Nick Desaulniers <ndesaulniers@...gle.com>

[ Upstream commit 63e80314ab7cf4783526d2e44ee57a90514911c9 ]

Clang cannot translate the string "r30" into a valid register yet.

Link: https://github.com/ClangBuiltLinux/linux/issues/755
Link: http://lkml.kernel.org/r/20191028155722.23419-1-ndesaulniers@google.com
Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
Suggested-by: Sid Manning <sidneym@...cinc.com>
Reviewed-by: Brian Cain <bcain@...eaurora.org>
Cc: Allison Randal <allison@...utok.net>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Richard Fontana <rfontana@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/hexagon/kernel/stacktrace.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/arch/hexagon/kernel/stacktrace.c b/arch/hexagon/kernel/stacktrace.c
index f94918b449a8..03a0e10ecdcc 100644
--- a/arch/hexagon/kernel/stacktrace.c
+++ b/arch/hexagon/kernel/stacktrace.c
@@ -23,8 +23,6 @@
 #include <linux/thread_info.h>
 #include <linux/module.h>
 
-register unsigned long current_frame_pointer asm("r30");
-
 struct stackframe {
 	unsigned long fp;
 	unsigned long rets;
@@ -42,7 +40,7 @@ void save_stack_trace(struct stack_trace *trace)
 
 	low = (unsigned long)task_stack_page(current);
 	high = low + THREAD_SIZE;
-	fp = current_frame_pointer;
+	fp = (unsigned long)__builtin_frame_address(0);
 
 	while (fp >= low && fp <= (high - sizeof(*frame))) {
 		frame = (struct stackframe *)fp;
-- 
2.20.1