iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

MIPS: head: Reorder instructions missing a delay slot

Browse Source 
commit 25d8b92e0af75d72ce8b99e63e5a449cc0888efa upstream.

In this sequence the 'move' is assumed in the delay slot of the 'beq',
but head.S is in reorder mode and the former gets pushed one 'nop'
farther by the assembler.

The corrected behavior made booting with an UHI supplied dtb erratic.

Fixes: 15f37e158892 ("MIPS: store the appended dtb address in a variable")
Signed-off-by: Karl Beldan <karl.beldan+oss@gmail.com>
Reviewed-by: James Hogan <james.hogan@imgtec.com>
Cc: Jonas Gorski <jogo@openwrt.org>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/16614/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Karl Beldan 2017-06-27 19:22:16 +00:00 committed by Greg Kroah-Hartman
parent b1355226a6
commit 3d4ac49a95
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/mips/kernel/head.S
View File

@ -106,8 +106,8 @@ NESTED(kernel_entry, 16, sp) # kernel entry point
beq t0, t1, dtb_found
#endif
li t1, -2
beq a0, t1, dtb_found
move t2, a1
beq a0, t1, dtb_found
li t2, 0
dtb_found: