linux-kernel - [PATCH v5 12/14] mips: Replace arch specific way to determine 32bit task with generic version

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Date:   Tue, 30 Jul 2019 01:51:11 -0400
From:   Alexandre Ghiti <alex@...ti.fr>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Luis Chamberlain <mcgrof@...nel.org>,
        Christoph Hellwig <hch@....de>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>,
        Palmer Dabbelt <palmer@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Kees Cook <keescook@...omium.org>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mips@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        Alexandre Ghiti <alex@...ti.fr>
Subject: [PATCH v5 12/14] mips: Replace arch specific way to determine 32bit task with generic version

Mips uses TASK_IS_32BIT_ADDR to determine if a task is 32bit, but
this define is mips specific and other arches do not have it: instead,
use !IS_ENABLED(CONFIG_64BIT) || is_compat_task() condition.

Signed-off-by: Alexandre Ghiti <alex@...ti.fr>
Acked-by: Paul Burton <paul.burton@...s.com>
Reviewed-by: Kees Cook <keescook@...omium.org>
Reviewed-by: Luis Chamberlain <mcgrof@...nel.org>
---
 arch/mips/mm/mmap.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/mips/mm/mmap.c b/arch/mips/mm/mmap.c
index ff6ab87e9c56..d5106c26ac6a 100644
--- a/arch/mips/mm/mmap.c
+++ b/arch/mips/mm/mmap.c
@@ -17,6 +17,7 @@
 #include <linux/sched/signal.h>
 #include <linux/sched/mm.h>
 #include <linux/sizes.h>
+#include <linux/compat.h>
 
 unsigned long shm_align_mask = PAGE_SIZE - 1;	/* Sane caches */
 EXPORT_SYMBOL(shm_align_mask);
@@ -191,7 +192,7 @@ static inline unsigned long brk_rnd(void)
 
 	rnd = rnd << PAGE_SHIFT;
 	/* 32MB for 32bit, 1GB for 64bit */
-	if (TASK_IS_32BIT_ADDR)
+	if (!IS_ENABLED(CONFIG_64BIT) || is_compat_task())
 		rnd = rnd & (SZ_32M - 1);
 	else
 		rnd = rnd & (SZ_1G - 1);
-- 
2.20.1