[PATCH 3/3] x86/boot: Drop unused implementation of panic()

[Ard Biesheuvel <ardb@kernel.org>]

The decompressor has its own implementation of panic(), which is based
on the vsnprintf() routine provided by the EFI stub.

The decompressor's panic() has no remaining users, and is implemented in
terms of the EFI stub's snprintf() implementation, which is going away
(and relying on the EFI stub from code that does not execute in the
context of the EFI boot services is a bad idea in general).

So drop it.

Acked-by: Kiryl Shutsemau (Meta) <kas@kernel.org>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
 arch/x86/boot/compressed/error.c | 19 -------------------
 arch/x86/boot/compressed/error.h |  1 -
 2 files changed, 20 deletions(-)

diff --git a/arch/x86/boot/compressed/error.c b/arch/x86/boot/compressed/error.c
index 19a8251de506..ce5ed7d8265e 100644
--- a/arch/x86/boot/compressed/error.c
+++ b/arch/x86/boot/compressed/error.c
@@ -22,22 +22,3 @@ void error(char *m)
 	while (1)
 		asm("hlt");
 }
-
-/* EFI libstub  provides vsnprintf() */
-#ifdef CONFIG_EFI_STUB
-void panic(const char *fmt, ...)
-{
-	static char buf[1024];
-	va_list args;
-	int len;
-
-	va_start(args, fmt);
-	len = vsnprintf(buf, sizeof(buf), fmt, args);
-	va_end(args);
-
-	if (len && buf[len - 1] == '\n')
-		buf[len - 1] = '\0';
-
-	error(buf);
-}
-#endif
diff --git a/arch/x86/boot/compressed/error.h b/arch/x86/boot/compressed/error.h
index 31f9e080d61a..87062dea9a20 100644
--- a/arch/x86/boot/compressed/error.h
+++ b/arch/x86/boot/compressed/error.h
@@ -6,6 +6,5 @@
 
 void warn(const char *m);
 void error(char *m) __noreturn;
-void panic(const char *fmt, ...) __noreturn __cold;
 
 #endif /* BOOT_COMPRESSED_ERROR_H */
-- 
2.47.3