Hi Stefan,
On 05/23/2015 01:25 AM, Stefan Agner wrote:
In Thumb2 mode, the stack register r13 is deprecated if the
destination register is the program counter (r15). Similar to
head.S, head-nommu.S uses r13 to store the return address used
after configuring the CPU's CP15 register. However, since we do
not enable a MMU, there will be no address switch and it is
possible to use branch with link instruction to call
__after_proc_init.
Avoid using r13 completely by using bl to call __after_proc_init
and get rid of __secondary_switched.
Beside removing unnecessary complexity, this also fixes a
compiler warning when compiling a !MMU kernel:
Warning: Use of r13 as a source register is deprecated when r15
is the destination register.
Suggested-by: Russell King <rmk+ker...@arm.linux.org.uk>
Signed-off-by: Stefan Agner <ste...@agner.ch>
---
Changes in v2:
- Load r7 outside CONFIG_ARM_MPU since its used outside later on
arch/arm/kernel/head-nommu.S | 21 ++++++++-------------
1 file changed, 8 insertions(+), 13 deletions(-)
You can add my:
Tested-by: Maxime Coquelin <mcoquelin.st...@gmail.com>
Thanks!
Maxime
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