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These changes are for patch_instruction() uses on data. Unlike ppc64 these should not be incorrect as-is, but using the patch_uint() alias better reflects what kind of data being patched and allows for benchmarking the effect of different patch_* implementations (e.g., skipping instruction flushing when patching data). Signed-off-by: Benjamin Gray <bgray@linux.ibm.com> Tested-by: Hari Bathini <hbathini@linux.ibm.com> Acked-by: Naveen N Rao <naveen@kernel.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://msgid.link/20240515024445.236364-5-bgray@linux.ibm.com
38 lines
933 B
C
38 lines
933 B
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/memory.h>
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#include <linux/static_call.h>
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#include <asm/code-patching.h>
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void arch_static_call_transform(void *site, void *tramp, void *func, bool tail)
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{
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int err;
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bool is_ret0 = (func == __static_call_return0);
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unsigned long target = (unsigned long)(is_ret0 ? tramp + PPC_SCT_RET0 : func);
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bool is_short = is_offset_in_branch_range((long)target - (long)tramp);
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if (!tramp)
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return;
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mutex_lock(&text_mutex);
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if (func && !is_short) {
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err = patch_ulong(tramp + PPC_SCT_DATA, target);
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if (err)
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goto out;
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}
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if (!func)
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err = patch_instruction(tramp, ppc_inst(PPC_RAW_BLR()));
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else if (is_short)
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err = patch_branch(tramp, target, 0);
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else
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err = patch_instruction(tramp, ppc_inst(PPC_RAW_NOP()));
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out:
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mutex_unlock(&text_mutex);
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if (err)
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panic("%s: patching failed %pS at %pS\n", __func__, func, tramp);
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}
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EXPORT_SYMBOL_GPL(arch_static_call_transform);
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