Merge tag 'xtensa-20240502' of https://github.com/jcmvbkbc/linux-xtensa

Pull xtensa fixes from Max Filippov:

 - fix unused variable warning caused by empty flush_dcache_page()
   definition

 - fix stack unwinding on windowed noMMU XIP configurations

 - fix Coccinelle warning 'opportunity for min()' in xtensa ISS platform
   code

* tag 'xtensa-20240502' of https://github.com/jcmvbkbc/linux-xtensa:
  xtensa: remove redundant flush_dcache_page and ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE macros
  tty: xtensa/iss: Use min() to fix Coccinelle warning
  xtensa: fix MAKE_PC_FROM_RA second argument

Author: torvalds

arch/xtensa/include/asm/cacheflush.h

@@ -100,6 +100,10 @@ void flush_cache_range(struct vm_area_struct*, ulong, ulong);
 void flush_icache_range(unsigned long start, unsigned long end);
 void flush_cache_page(struct vm_area_struct*,
 			     unsigned long, unsigned long);
+#define flush_cache_all flush_cache_all
+#define flush_cache_range flush_cache_range
+#define flush_icache_range flush_icache_range
+#define flush_cache_page flush_cache_page
 #else
 #define flush_cache_all local_flush_cache_all
 #define flush_cache_range local_flush_cache_range
@@ -136,20 +140,7 @@ void local_flush_cache_page(struct vm_area_struct *vma,
 
 #else
 
-#define flush_cache_all()				do { } while (0)
-#define flush_cache_mm(mm)				do { } while (0)
-#define flush_cache_dup_mm(mm)				do { } while (0)
-
-#define flush_cache_vmap(start,end)			do { } while (0)
-#define flush_cache_vmap_early(start,end)		do { } while (0)
-#define flush_cache_vunmap(start,end)			do { } while (0)
-
-#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0
-#define flush_dcache_page(page)				do { } while (0)
-
 #define flush_icache_range local_flush_icache_range
-#define flush_cache_page(vma, addr, pfn)		do { } while (0)
-#define flush_cache_range(vma, start, end)		do { } while (0)
 
 #endif
 
@@ -162,15 +153,14 @@ void local_flush_cache_page(struct vm_area_struct *vma,
 		__invalidate_icache_range(start,(end) - (start));	\
 	} while (0)
 
-#define flush_dcache_mmap_lock(mapping)			do { } while (0)
-#define flush_dcache_mmap_unlock(mapping)		do { } while (0)
-
 #if defined(CONFIG_MMU) && (DCACHE_WAY_SIZE > PAGE_SIZE)
 
 extern void copy_to_user_page(struct vm_area_struct*, struct page*,
 		unsigned long, void*, const void*, unsigned long);
 extern void copy_from_user_page(struct vm_area_struct*, struct page*,
 		unsigned long, void*, const void*, unsigned long);
+#define copy_to_user_page copy_to_user_page
+#define copy_from_user_page copy_from_user_page
 
 #else
 
@@ -186,4 +176,6 @@ extern void copy_from_user_page(struct vm_area_struct*, struct page*,
 
 #endif
 
+#include <asm-generic/cacheflush.h>
+
 #endif /* _XTENSA_CACHEFLUSH_H */

arch/xtensa/include/asm/processor.h

@@ -115,9 +115,9 @@
 #define MAKE_RA_FOR_CALL(ra,ws)   (((ra) & 0x3fffffff) | (ws) << 30)
 
 /* Convert return address to a valid pc
- * Note: We assume that the stack pointer is in the same 1GB ranges as the ra
+ * Note: 'text' is the address within the same 1GB range as the ra
  */
-#define MAKE_PC_FROM_RA(ra,sp)    (((ra) & 0x3fffffff) | ((sp) & 0xc0000000))
+#define MAKE_PC_FROM_RA(ra, text) (((ra) & 0x3fffffff) | ((unsigned long)(text) & 0xc0000000))
 
 #elif defined(__XTENSA_CALL0_ABI__)
 
@@ -127,9 +127,9 @@
 #define MAKE_RA_FOR_CALL(ra, ws)   (ra)
 
 /* Convert return address to a valid pc
- * Note: We assume that the stack pointer is in the same 1GB ranges as the ra
+ * Note: 'text' is not used as 'ra' is always the full address
  */
-#define MAKE_PC_FROM_RA(ra, sp)    (ra)
+#define MAKE_PC_FROM_RA(ra, text)  (ra)
 
 #else
 #error Unsupported Xtensa ABI

arch/xtensa/include/asm/ptrace.h

@@ -87,7 +87,7 @@ struct pt_regs {
 # define user_mode(regs) (((regs)->ps & 0x00000020)!=0)
 # define instruction_pointer(regs) ((regs)->pc)
 # define return_pointer(regs) (MAKE_PC_FROM_RA((regs)->areg[0], \
-					       (regs)->areg[1]))
+					       (regs)->pc))
 
 # ifndef CONFIG_SMP
 #  define profile_pc(regs) instruction_pointer(regs)

arch/xtensa/kernel/process.c

@@ -47,6 +47,7 @@
 #include <asm/asm-offsets.h>
 #include <asm/regs.h>
 #include <asm/hw_breakpoint.h>
+#include <asm/sections.h>
 #include <asm/traps.h>
 
 extern void ret_from_fork(void);
@@ -380,7 +381,7 @@ unsigned long __get_wchan(struct task_struct *p)
 	int count = 0;
 
 	sp = p->thread.sp;
-	pc = MAKE_PC_FROM_RA(p->thread.ra, p->thread.sp);
+	pc = MAKE_PC_FROM_RA(p->thread.ra, _text);
 
 	do {
 		if (sp < stack_page + sizeof(struct task_struct) ||
@@ -392,7 +393,7 @@ unsigned long __get_wchan(struct task_struct *p)
 
 		/* Stack layout: sp-4: ra, sp-3: sp' */
 
-		pc = MAKE_PC_FROM_RA(SPILL_SLOT(sp, 0), sp);
+		pc = MAKE_PC_FROM_RA(SPILL_SLOT(sp, 0), _text);
 		sp = SPILL_SLOT(sp, 1);
 	} while (count++ < 16);
 	return 0;

arch/xtensa/kernel/stacktrace.c

@@ -13,6 +13,7 @@
 #include <linux/stacktrace.h>
 
 #include <asm/ftrace.h>
+#include <asm/sections.h>
 #include <asm/stacktrace.h>
 #include <asm/traps.h>
 #include <linux/uaccess.h>
@@ -189,7 +190,7 @@ void walk_stackframe(unsigned long *sp,
 		if (a1 <= (unsigned long)sp)
 			break;
 
-		frame.pc = MAKE_PC_FROM_RA(a0, a1);
+		frame.pc = MAKE_PC_FROM_RA(a0, _text);
 		frame.sp = a1;
 
 		if (fn(&frame, data))

arch/xtensa/platforms/iss/console.c

@@ -166,10 +166,8 @@ late_initcall(rs_init);
 
 static void iss_console_write(struct console *co, const char *s, unsigned count)
 {
-	if (s && *s != 0) {
-		int len = strlen(s);
-		simc_write(1, s, count < len ? count : len);
-	}
+	if (s && *s != 0)
+		simc_write(1, s, min(count, strlen(s)));
 }
 
 static struct tty_driver* iss_console_device(struct console *c, int *index)