ARM: OMAP2+: Fix wait_dll_lock_timed for rodata

We don't want to be writing to .text so it can be set rodata.
Fix error "Unable to handle kernel paging request at virtual address
c012396c" in wait_dll_lock_timed if CONFIG_DEBUG_RODATA is selected.

As these counters are for debugging only and unused, we can just
remove them.

Cc: Kees Cook <keescook@chromium.org>
Cc: Laura Abbott <labbott@redhat.com>
Cc: Nishanth Menon <nm@ti.com>
Cc: Richard Woodruff <r-woodruff2@ti.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Tero Kristo <t-kristo@ti.com>
Acked-by: Nicolas Pitre <nico@linaro.org>
Cc: stable@vger.kernel.org # v4.0+
Fixes: 1e6b48116a95 ("ARM: mm: allow non-text sections to be
non-executable")
Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/arch/arm/mach-omap2/sleep34xx.S b/arch/arm/mach-omap2/sleep34xx.S
index eafd120..787cfda 100644 (file)
--- a/arch/arm/mach-omap2/sleep34xx.S
+++ b/arch/arm/mach-omap2/sleep34xx.S
@@ -289,12 +289,6 @@ wait_sdrc_ready:
        bic     r5, r5, #0x40
        str     r5, [r4]
 
-/*
- * PC-relative stores lead to undefined behaviour in Thumb-2: use a r7 as a
- * base instead.
- * Be careful not to clobber r7 when maintaing this code.
- */
-
 is_dll_in_lock_mode:
        /* Is dll in lock mode? */
        ldr     r4, sdrc_dlla_ctrl
@@ -302,11 +296,7 @@ is_dll_in_lock_mode:
        tst     r5, #0x4
        bne     exit_nonoff_modes       @ Return if locked
        /* wait till dll locks */
-       adr     r7, kick_counter
 wait_dll_lock_timed:
-       ldr     r4, wait_dll_lock_counter
-       add     r4, r4, #1
-       str     r4, [r7, #wait_dll_lock_counter - kick_counter]
        ldr     r4, sdrc_dlla_status
        /* Wait 20uS for lock */
        mov     r6, #8
@@ -330,9 +320,6 @@ kick_dll:
        orr     r6, r6, #(1<<3)         @ enable dll
        str     r6, [r4]
        dsb
-       ldr     r4, kick_counter
-       add     r4, r4, #1
-       str     r4, [r7]                @ kick_counter
        b       wait_dll_lock_timed
 
 exit_nonoff_modes:
@@ -360,15 +347,6 @@ sdrc_dlla_status:
        .word   SDRC_DLLA_STATUS_V
 sdrc_dlla_ctrl:
        .word   SDRC_DLLA_CTRL_V
-       /*
-        * When exporting to userspace while the counters are in SRAM,
-        * these 2 words need to be at the end to facilitate retrival!
-        */
-kick_counter:
-       .word   0
-wait_dll_lock_counter:
-       .word   0
-
 ENTRY(omap3_do_wfi_sz)
        .word   . - omap3_do_wfi