MIPS: Allow compact branch policy to be changed

When debugging it can be helpful to change the policy for compiler use
of MIPSr6 compact branches, in order to rule out or home in on their
involvement in bugs. Allow the GCC -mcompact-branches= flag to be set
via Kconfig under the "Kernel hacking" menu.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/11178/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/Kconfig.debug b/arch/mips/Kconfig.debug
index e250524021aca8ec7e1b79bfd0b4f088d96f109d..13d796547ebdf9544260848b18ae0619e47f696b 100644 (file)
--- a/arch/mips/Kconfig.debug
+++ b/arch/mips/Kconfig.debug
@@ -113,4 +113,40 @@ config SPINLOCK_TEST
        help
          Add several files to the debugfs to test spinlock speed.
 
+if CPU_MIPSR6
+
+choice
+       prompt "Compact branch policy"
+       default MIPS_COMPACT_BRANCHES_OPTIMAL
+
+config MIPS_COMPACT_BRANCHES_NEVER
+       bool "Never (force delay slot branches)"
+       help
+         Pass the -mcompact-branches=never flag to the compiler in order to
+         force it to always emit branches with delay slots, and make no use
+         of the compact branch instructions introduced by MIPSr6. This is
+         useful if you suspect there may be an issue with compact branches in
+         either the compiler or the CPU.
+
+config MIPS_COMPACT_BRANCHES_OPTIMAL
+       bool "Optimal (use where beneficial)"
+       help
+         Pass the -mcompact-branches=optimal flag to the compiler in order for
+         it to make use of compact branch instructions where it deems them
+         beneficial, and use branches with delay slots elsewhere. This is the
+         default compiler behaviour, and should be used unless you have a
+         reason to choose otherwise.
+
+config MIPS_COMPACT_BRANCHES_ALWAYS
+       bool "Always (force compact branches)"
+       help
+         Pass the -mcompact-branches=always flag to the compiler in order to
+         force it to always emit compact branches, making no use of branch
+         instructions with delay slots. This can result in more compact code
+         which may be beneficial in some scenarios.
+
+endchoice
+
+endif # CPU_MIPSR6
+
 endmenu

diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index 252e347958f383354a597323078512846f592d52..3f70ba54ae21e909973ad9913eb71151fcc50492 100644 (file)
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -204,6 +204,10 @@ toolchain-msa                              := $(call cc-option-yn,$(mips-cflags) -mhard-float -mfp64 -Wa$(
 cflags-$(toolchain-msa)                        += -DTOOLCHAIN_SUPPORTS_MSA
 endif
 
+cflags-$(CONFIG_MIPS_COMPACT_BRANCHES_NEVER)   += -mcompact-branches=never
+cflags-$(CONFIG_MIPS_COMPACT_BRANCHES_OPTIMAL) += -mcompact-branches=optimal
+cflags-$(CONFIG_MIPS_COMPACT_BRANCHES_ALWAYS)  += -mcompact-branches=always
+
 #
 # Firmware support
 #