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Subject[PATCH v6 7/8] x86/microcode/AMD: Add a reminder about PATCH_MAX_SIZE macro
Date
The PATCH_MAX_SIZE macro should contain the maximum of all family patch
sizes.
Since these sizes are defined in an other place than this macro, let's add
a reminder to them so people will remember to verify PATCH_MAX_SIZE
correctness when modifying a family patch size or adding a new family.

Signed-off-by: Maciej S. Szmigiero <mail@maciej.szmigiero.name>
---
arch/x86/include/asm/microcode_amd.h | 1 +
arch/x86/kernel/cpu/microcode/amd.c | 4 ++++
2 files changed, 5 insertions(+)

diff --git a/arch/x86/include/asm/microcode_amd.h b/arch/x86/include/asm/microcode_amd.h
index 209492849566..8ea477fbc65f 100644
--- a/arch/x86/include/asm/microcode_amd.h
+++ b/arch/x86/include/asm/microcode_amd.h
@@ -41,6 +41,7 @@ struct microcode_amd {
unsigned int mpb[0];
};

+/* Maximum patch size of all supported families */
#define PATCH_MAX_SIZE PAGE_SIZE

#ifdef CONFIG_MICROCODE_AMD
diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c
index 764dac82c03f..cc38182c76d2 100644
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -199,6 +199,10 @@ static bool verify_patch(u8 family, const u8 *buf, size_t buf_size, bool early)

patch_size = hdr[1];

+/*
+ * If you modify these values or add a new one also check whether
+ * PATCH_MAX_SIZE in include/asm/microcode_amd.h needs updating, too.
+ */
#define F1XH_MPB_MAX_SIZE 2048
#define F14H_MPB_MAX_SIZE 1824
#define F15H_MPB_MAX_SIZE 4096
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