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authorDouglas Anderson <dianders@chromium.org>2019-11-09 11:16:44 -0800
committerDaniel Thompson <daniel.thompson@linaro.org>2020-01-31 17:34:03 +0000
commitbbfceba15f8d1260c328a254efc2b3f2deae4904 (patch)
tree7a5a1d1bfa085a2ac07ede27a2af6c7c0c0189fc
parent9441d5f6b77770ee388884f04b14a99b028a15e6 (diff)
kdb: Get rid of confusing diag msg from "rd" if current task has no regs
If you switch to a sleeping task with the "pid" command and then type "rd", kdb tells you this: No current kdb registers. You may need to select another task diag: -17: Invalid register name The first message makes sense, but not the second. Fix it by just returning 0 after commands accessing the current registers finish if we've already printed the "No current kdb registers" error. While fixing kdb_rd(), change the function to use "if" rather than "ifdef". It cleans the function up a bit and any modern compiler will have no trouble handling still producing good code. Signed-off-by: Douglas Anderson <dianders@chromium.org> Link: https://lore.kernel.org/r/20191109111624.5.I121f4c6f0c19266200bf6ef003de78841e5bfc3d@changeid Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
-rw-r--r--kernel/debug/kdb/kdb_main.c28
1 files changed, 13 insertions, 15 deletions
diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
index ba12e9f4661e..b22292b649c4 100644
--- a/kernel/debug/kdb/kdb_main.c
+++ b/kernel/debug/kdb/kdb_main.c
@@ -543,9 +543,8 @@ int kdbgetaddrarg(int argc, const char **argv, int *nextarg,
if (diag)
return diag;
} else if (symname[0] == '%') {
- diag = kdb_check_regs();
- if (diag)
- return diag;
+ if (kdb_check_regs())
+ return 0;
/* Implement register values with % at a later time as it is
* arch optional.
*/
@@ -1836,8 +1835,7 @@ static int kdb_go(int argc, const char **argv)
*/
static int kdb_rd(int argc, const char **argv)
{
- int len = kdb_check_regs();
-#if DBG_MAX_REG_NUM > 0
+ int len = 0;
int i;
char *rname;
int rsize;
@@ -1846,8 +1844,14 @@ static int kdb_rd(int argc, const char **argv)
u16 reg16;
u8 reg8;
- if (len)
- return len;
+ if (kdb_check_regs())
+ return 0;
+
+ /* Fallback to Linux showregs() if we don't have DBG_MAX_REG_NUM */
+ if (DBG_MAX_REG_NUM <= 0) {
+ kdb_dumpregs(kdb_current_regs);
+ return 0;
+ }
for (i = 0; i < DBG_MAX_REG_NUM; i++) {
rsize = dbg_reg_def[i].size * 2;
@@ -1889,12 +1893,7 @@ static int kdb_rd(int argc, const char **argv)
}
}
kdb_printf("\n");
-#else
- if (len)
- return len;
- kdb_dumpregs(kdb_current_regs);
-#endif
return 0;
}
@@ -1928,9 +1927,8 @@ static int kdb_rm(int argc, const char **argv)
if (diag)
return diag;
- diag = kdb_check_regs();
- if (diag)
- return diag;
+ if (kdb_check_regs())
+ return 0;
diag = KDB_BADREG;
for (i = 0; i < DBG_MAX_REG_NUM; i++) {

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