crash/0041-Let-kmem-print-task-context-with-physical-address.patch

From 2c24770e3ceab8eebd9788256967b79145f53123 Mon Sep 17 00:00:00 2001
From: Tao Liu <ltao@redhat.com>
Date: Mon, 19 Sep 2022 17:49:23 +0800
Subject: [PATCH 41/89] Let "kmem" print task context with physical address

Patch [1] enables "kmem" to print task context if the given virtual
address is a vmalloced stack.

This patch lets "kmem" print task context also when the given address
is a physical address.

Before:
    crash> kmem 1883700e28
       VMAP_AREA         VM_STRUCT                 ADDRESS RANGE                SIZE
    ffff94eb9102c640  ffff94eb9102b140  ffffb7efce9b8000 - ffffb7efce9bd000    20480

	  PAGE         PHYSICAL      MAPPING       INDEX CNT FLAGS
    ffffdd28220dc000 1883700000                0        0  1 50000000000000

After:
    crash> kmem 1883700e28
	PID: 847
    COMMAND: "khungtaskd"
       TASK: ffff94f8038f4000  [THREAD_INFO: ffff94f8038f4000]
	CPU: 72
      STATE: TASK_RUNNING (PANIC)

       VMAP_AREA         VM_STRUCT                 ADDRESS RANGE                SIZE
    ffff94eb9102c640  ffff94eb9102b140  ffffb7efce9b8000 - ffffb7efce9bd000    20480

	  PAGE         PHYSICAL      MAPPING       INDEX CNT FLAGS
    ffffdd28220dc000 1883700000                0        0  1 50000000000000

[1]: https://listman.redhat.com/archives/crash-utility/2022-September/010115.html

[ kh: squashed the 4/4 patch into 3/4 ]

Signed-off-by: Tao Liu <ltao@redhat.com>
Signed-off-by: Kazuhito Hagio <k-hagio-ab@nec.com>
Signed-off-by: Lianbo Jiang <lijiang@redhat.com>
---
 memory.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/memory.c b/memory.c
index 1b6f9ba17e57..c80ef61bdcf7 100644
--- a/memory.c
+++ b/memory.c
@@ -13506,6 +13506,10 @@ kmem_search(struct meminfo *mi)
 		mi->flags &= ~GET_PHYS_TO_VMALLOC;
 
 		if (mi->retval) {
+			if ((task = stkptr_to_task(mi->retval)) && (tc = task_to_context(task))) {
+				show_context(tc);
+				fprintf(fp, "\n");
+			}
 			if ((sp = value_search(mi->retval, &offset))) {
                         	show_symbol(sp, offset, 
 					SHOW_LINENUM | SHOW_RADIX());
@@ -13562,11 +13566,11 @@ kmem_search(struct meminfo *mi)
 	/*
 	 *  Check whether it's a current task or stack address.
 	 */
-	if ((mi->memtype == KVADDR) && (task = vaddr_in_task_struct(vaddr)) &&
+	if ((mi->memtype & (KVADDR|PHYSADDR)) && (task = vaddr_in_task_struct(vaddr)) &&
 	    (tc = task_to_context(task))) {
 		show_context(tc);
 		fprintf(fp, "\n");
-	} else if ((mi->memtype == KVADDR) && (task = stkptr_to_task(vaddr)) &&
+	} else if ((mi->memtype & (KVADDR|PHYSADDR)) && (task = stkptr_to_task(vaddr)) &&
 	    (tc = task_to_context(task))) {
 		show_context(tc);
 		fprintf(fp, "\n");
-- 
2.37.1