powerpc/64s: Fix unrelocated interrupt trampoline address test

The recent commit got this test wrong, it declared the assembler
symbols the wrong way, and also used the wrong symbol name
(xxx_start rather than start_xxx, see asm/head-64.h).

Fixes: ccd47702 ("powerpc/64s: Fix HV NMI vs HV interrupt recoverability test")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/include/asm/asm-prototypes.h

@@ -49,14 +49,6 @@ int exit_vmx_usercopy(void);
 int enter_vmx_ops(void);
 void *exit_vmx_ops(void *dest);
 
-/* Exceptions */
-#ifdef CONFIG_PPC_POWERNV
-extern unsigned long real_trampolines_start;
-extern unsigned long real_trampolines_end;
-extern unsigned long virt_trampolines_start;
-extern unsigned long virt_trampolines_end;
-#endif
-
 /* Traps */
 long machine_check_early(struct pt_regs *regs);
 long hmi_exception_realmode(struct pt_regs *regs);

arch/powerpc/include/asm/sections.h

@@ -17,6 +17,13 @@ extern char __end_interrupts[];
 extern char __prom_init_toc_start[];
 extern char __prom_init_toc_end[];
 
+#ifdef CONFIG_PPC_POWERNV
+extern char start_real_trampolines[];
+extern char end_real_trampolines[];
+extern char start_virt_trampolines[];
+extern char end_virt_trampolines[];
+#endif
+
 static inline int in_kernel_text(unsigned long addr)
 {
 	if (addr >= (unsigned long)_stext && addr < (unsigned long)__init_end)

arch/powerpc/kernel/exceptions-64s.S

@@ -70,10 +70,10 @@ OPEN_FIXED_SECTION(virt_vectors,        0x4000, 0x5900)
 OPEN_FIXED_SECTION(virt_trampolines,    0x5900, 0x7000)
 
 #ifdef CONFIG_PPC_POWERNV
-	.globl real_trampolines_start
-	.globl real_trampolines_end
-	.globl virt_trampolines_start
-	.globl virt_trampolines_end
+	.globl start_real_trampolines
+	.globl end_real_trampolines
+	.globl start_virt_trampolines
+	.globl end_virt_trampolines
 #endif
 
 #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)

arch/powerpc/kernel/traps.c

@@ -419,12 +419,13 @@ void hv_nmi_check_nonrecoverable(struct pt_regs *regs)
 		goto nonrecoverable;
 	if ((nip >= 0xf80 && nip < 0xfa0) || (nip >= 0x4f80 && nip < 0x4fa0))
 		goto nonrecoverable;
+
 	/* Trampoline code runs un-relocated so subtract kbase. */
-	if (nip >= real_trampolines_start - kbase &&
-			nip < real_trampolines_end - kbase)
+	if (nip >= (unsigned long)(start_real_trampolines - kbase) &&
+			nip < (unsigned long)(end_real_trampolines - kbase))
 		goto nonrecoverable;
-	if (nip >= virt_trampolines_start - kbase &&
-			nip < virt_trampolines_end - kbase)
+	if (nip >= (unsigned long)(start_virt_trampolines - kbase) &&
+			nip < (unsigned long)(end_virt_trampolines - kbase))
 		goto nonrecoverable;
 	return;