Re: [PATCH 5.15 3/9] arm64: insn: Add support for encoding DSB

[Sasha Levin <sashal@kernel.org>]

[ Sasha's backport helper bot ]

Hi,

✅ All tests passed successfully. No issues detected.
No action required from the submitter.

The upstream commit SHA1 provided is correct: 63de8abd97ddb9b758bd8f915ecbd18e1f1a87a0

WARNING: Author mismatch between patch and upstream commit:
Backport author: Pu Lehui<pulehui@huaweicloud.com>
Commit author: James Morse<james.morse@arm.com>

Status in newer kernel trees:
6.15.y | Present (exact SHA1)
6.14.y | Present (different SHA1: 1e1963205784)
6.12.y | Present (different SHA1: 2a3915e86187)
6.6.y | Present (different SHA1: 054fc98d691a)
6.1.y | Present (different SHA1: cc0b8e148c33)

Note: The patch differs from the upstream commit:
---
1:  63de8abd97ddb ! 1:  97289ab86ac0c arm64: insn: Add support for encoding DSB
    @@ Metadata
      ## Commit message ##
         arm64: insn: Add support for encoding DSB
     
    +    [ Upstream commit 63de8abd97ddb9b758bd8f915ecbd18e1f1a87a0 ]
    +
         To generate code in the eBPF epilogue that uses the DSB instruction,
         insn.c needs a heler to encode the type and domain.
     
    @@ Commit message
     
         Signed-off-by: James Morse <james.morse@arm.com>
         Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
    +    Signed-off-by: Pu Lehui <pulehui@huawei.com>
     
      ## arch/arm64/include/asm/insn.h ##
     @@ arch/arm64/include/asm/insn.h: u32 aarch64_insn_gen_cas(enum aarch64_insn_register result,
    @@ arch/arm64/include/asm/insn.h: u32 aarch64_insn_gen_cas(enum aarch64_insn_regist
      #endif
      u32 aarch64_insn_gen_dmb(enum aarch64_insn_mb_type type);
     +u32 aarch64_insn_gen_dsb(enum aarch64_insn_mb_type type);
    - u32 aarch64_insn_gen_mrs(enum aarch64_insn_register result,
    - 			 enum aarch64_insn_system_register sysreg);
      
    + s32 aarch64_get_branch_offset(u32 insn);
    + u32 aarch64_set_branch_offset(u32 insn, s32 offset);
     
      ## arch/arm64/lib/insn.c ##
     @@
    @@ arch/arm64/lib/insn.c: u32 aarch64_insn_gen_extr(enum aarch64_insn_variant varia
      	insn = aarch64_insn_get_dmb_value();
      	insn &= ~GENMASK(11, 8);
     @@ arch/arm64/lib/insn.c: u32 aarch64_insn_gen_dmb(enum aarch64_insn_mb_type type)
    + 
      	return insn;
      }
    - 
    ++
     +u32 aarch64_insn_gen_dsb(enum aarch64_insn_mb_type type)
     +{
     +	u32 opt, insn;
    @@ arch/arm64/lib/insn.c: u32 aarch64_insn_gen_dmb(enum aarch64_insn_mb_type type)
     +
     +	return insn;
     +}
    -+
    - u32 aarch64_insn_gen_mrs(enum aarch64_insn_register result,
    - 			 enum aarch64_insn_system_register sysreg)
    - {
---

Results of testing on various branches:

| Branch                    | Patch Apply | Build Test |
|---------------------------|-------------|------------|
| stable/linux-6.1.y        |  Success    |  Success   |