[RFC PATCH] docs/system/deprecated: mark ppc64abi32-linux-user for deprecation
It's buggy and we are not sure anyone uses it. Cc: David Gibson <david@gibson.dropbear.id.au> Cc: Richard Henderson <rth@twiddle.net> Signed-off-by: Alex Bennée <alex.bennee@linaro.org> --- docs/system/deprecated.rst | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/docs/system/deprecated.rst b/docs/system/deprecated.rst index 851dbdeb8ab..11c763383d9 100644 --- a/docs/system/deprecated.rst +++ b/docs/system/deprecated.rst @@ -424,6 +424,15 @@ linux-user mode) is deprecated and will be removed in a future version of QEMU. Support for this CPU was removed from the upstream Linux kernel in 2018, and has also been dropped from glibc. +``ppc64abi32`` CPUs (since 5.2.0) +''''''''''''''''''''''''''''''''' + +The ``ppc64abi32`` architecture has a number of issues which regularly +trip up our CI testing and is suspected to be quite broken. +Furthermore the maintainers are unsure what the correct behaviour +should be and strongly suspect no one actually uses it. + + Related binaries ---------------- -- 2.20.1
Alex Bennée <alex.bennee@linaro.org> writes:
It's buggy and we are not sure anyone uses it.
Cc: David Gibson <david@gibson.dropbear.id.au> Cc: Richard Henderson <rth@twiddle.net> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
A more aggressive follow-up patch which would also solve the CI failures across the board: --8<---------------cut here---------------start------------->8--- configure: don't enable ppc64abi32-linux-user by default The user can still enable this explicitly but they will get a warning at the end of configure for their troubles. This also drops any builds of ppc64abi32 from our CI tests. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> 1 file changed, 27 insertions(+), 19 deletions(-) configure | 46 +++++++++++++++++++++++++++------------------- modified configure @@ -574,6 +574,8 @@ gettext="" bogus_os="no" malloc_trim="" +deprecated_features="" + # parse CC options first for opt do optarg=$(expr "x$opt" : 'x[^=]*=\(.*\)') @@ -1769,26 +1771,25 @@ if [ "$bsd_user" = "yes" ]; then mak_wilds="${mak_wilds} $source_path/default-configs/*-bsd-user.mak" fi -if test -z "$target_list_exclude"; then - for config in $mak_wilds; do - default_target_list="${default_target_list} $(basename "$config" .mak)" - done -else - exclude_list=$(echo "$target_list_exclude" | sed -e 's/,/ /g') - for config in $mak_wilds; do - target="$(basename "$config" .mak)" - exclude="no" - for excl in $exclude_list; do - if test "$excl" = "$target"; then - exclude="yes" - break; - fi - done - if test "$exclude" = "no"; then - default_target_list="${default_target_list} $target" +if test -z "$target_list_exclude" -a -z "$target_list"; then + # if the user doesn't specify anything lets skip deprecating stuff + target_list_exclude=ppc64abi32-linux-user +fi + +exclude_list=$(echo "$target_list_exclude" | sed -e 's/,/ /g') +for config in $mak_wilds; do + target="$(basename "$config" .mak)" + exclude="no" + for excl in $exclude_list; do + if test "$excl" = "$target"; then + exclude="yes" + break; fi done -fi + if test "$exclude" = "no"; then + default_target_list="${default_target_list} $target" + fi +done # Enumerate public trace backends for --help output trace_backend_list=$(echo $(grep -le '^PUBLIC = True$' "$source_path"/scripts/tracetool/backend/*.py | sed -e 's/^.*\/\(.*\)\.py$/\1/')) @@ -7691,7 +7692,7 @@ TARGET_SYSTBL="" case "$target_name" in i386) mttcg="yes" - gdb_xml_files="i386-32bit.xml" + gdb_xml_files="i386-32bit.xml" TARGET_SYSTBL_ABI=i386 TARGET_SYSTBL=syscall_32.tbl ;; @@ -7802,6 +7803,7 @@ case "$target_name" in TARGET_SYSTBL_ABI=common,nospu,32 echo "TARGET_ABI32=y" >> $config_target_mak gdb_xml_files="power64-core.xml power-fpu.xml power-altivec.xml power-spe.xml power-vsx.xml" + deprecated_features="ppc64abi32 ${deprecated_features}" ;; riscv32) TARGET_BASE_ARCH=riscv @@ -8232,6 +8234,12 @@ fi touch ninjatool.stamp fi +if test -n "${deprecated_features}"; then + echo "Warning, deprecated features enabled." + echo "Please see docs/system/deprecated.rst" + echo " features: ${deprecated_features}" +fi + # Save the configure command line for later reuse. cat <<EOD >config.status #!/bin/sh --8<---------------cut here---------------end--------------->8--- -- Alex Bennée
On Fri, 4 Sep 2020 at 17:52, Alex Bennée <alex.bennee@linaro.org> wrote:
It's buggy and we are not sure anyone uses it.
+``ppc64abi32`` CPUs (since 5.2.0) +''''''''''''''''''''''''''''''''' + +The ``ppc64abi32`` architecture has a number of issues which regularly +trip up our CI testing and is suspected to be quite broken. +Furthermore the maintainers are unsure what the correct behaviour +should be and strongly suspect no one actually uses it.
IRC discussion suggests we do know what the correct behaviour is -- it should be "what the compat32 interface of a 64-bit PPC kernel gives you", it's just that the code doesn't do that (and never has?). It's like the mipsn32, mipsn32el, sparc32plus ABIs which we also implement (hopefully correctly...) But "this has always been broken and nobody complained" is a good reason to deprecate anyway. thanks -- PMM
On 9/4/20 10:21 AM, Peter Maydell wrote:
On Fri, 4 Sep 2020 at 17:52, Alex Bennée <alex.bennee@linaro.org> wrote:
It's buggy and we are not sure anyone uses it.
+``ppc64abi32`` CPUs (since 5.2.0) +''''''''''''''''''''''''''''''''' + +The ``ppc64abi32`` architecture has a number of issues which regularly +trip up our CI testing and is suspected to be quite broken. +Furthermore the maintainers are unsure what the correct behaviour +should be and strongly suspect no one actually uses it.
IRC discussion suggests we do know what the correct behaviour is -- it should be "what the compat32 interface of a 64-bit PPC kernel gives you", it's just that the code doesn't do that (and never has?). It's like the mipsn32, mipsn32el, sparc32plus ABIs which we also implement (hopefully correctly...)
But "this has always been broken and nobody complained" is a good reason to deprecate anyway.
Indeed. With the last sentence changed to "For that reason the maintainers strongly suspect no one actually uses it." Reviewed-by: Richard Henderson <richard.henderson@linaro.org> r~
Peter Maydell <peter.maydell@linaro.org> writes:
On Fri, 4 Sep 2020 at 17:52, Alex Bennée <alex.bennee@linaro.org> wrote:
It's buggy and we are not sure anyone uses it.
+``ppc64abi32`` CPUs (since 5.2.0) +''''''''''''''''''''''''''''''''' + +The ``ppc64abi32`` architecture has a number of issues which regularly +trip up our CI testing and is suspected to be quite broken. +Furthermore the maintainers are unsure what the correct behaviour +should be and strongly suspect no one actually uses it.
IRC discussion suggests we do know what the correct behaviour is -- it should be "what the compat32 interface of a 64-bit PPC kernel gives you", it's just that the code doesn't do that (and never has?). It's like the mipsn32, mipsn32el, sparc32plus ABIs which we also implement (hopefully correctly...)
But "this has always been broken and nobody complained" is a good reason to deprecate anyway.
What about tweaking configure? Or should I just manually squash it in all our CI configs? -- Alex Bennée
On Fri, Sep 04, 2020 at 05:51:40PM +0100, Alex Bennée wrote:
It's buggy and we are not sure anyone uses it.
Cc: David Gibson <david@gibson.dropbear.id.au> Cc: Richard Henderson <rth@twiddle.net> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
--- docs/system/deprecated.rst | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/docs/system/deprecated.rst b/docs/system/deprecated.rst index 851dbdeb8ab..11c763383d9 100644 --- a/docs/system/deprecated.rst +++ b/docs/system/deprecated.rst @@ -424,6 +424,15 @@ linux-user mode) is deprecated and will be removed in a future version of QEMU. Support for this CPU was removed from the upstream Linux kernel in 2018, and has also been dropped from glibc.
+``ppc64abi32`` CPUs (since 5.2.0) +''''''''''''''''''''''''''''''''' + +The ``ppc64abi32`` architecture has a number of issues which regularly +trip up our CI testing and is suspected to be quite broken. +Furthermore the maintainers are unsure what the correct behaviour +should be and strongly suspect no one actually uses it. + + Related binaries ----------------
-- David Gibson | I'll have my music baroque, and my code david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_ | _way_ _around_! http://www.ozlabs.org/~dgibson
participants (4)
-
Alex Bennée -
David Gibson -
Peter Maydell -
Richard Henderson